Steam-boiler.



' PATENTED NOV. 3, 1903.

L. L. GRIFFITHS. STEAM BOILER.

APPLIGATIQN FILED MAR. s, 1902.

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N0 MODEL.

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L. L. GRIFFITHS.

' STEAM BOILER.

APPLICATION FILED MAR. 8, 1902.

N0 MODEL. 4 SHEETS-SHEET 2.

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PATENTED NOV. 3, 1903. L. L. GRIFFITHS.

STEAM BOILER. APPLICATION FILED MAR. s, 1902.

4 SHEETS-SHEET 4.

N0 MODEL.

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Patented November 3, 1903.

PATENT OFFICE.

LEONARD L. GRIFFITHS, OF BROOKLYN, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 743,2'71ydated November 3, 1903. Application filed March 8, 1902. Serial No. 97,264. (No model.)

T 60% whomit may concern.-

Be it known that I, LEONARD L. GRIFFITHS, a citizen of the United States, residing at the city of New York, borough of Brooklyn, Kings county, in the Stateof New York, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a full, clear, and exact specification.

My invention relates to improvements in steam-boilers; and the same has for its object more particularly to provide an internallyfired sectional water-tube boiler presenting increased heating-surface and capable of holding a large body of self-contained water separated into numerous small volumes, where-- by to insure rapid evaporation and production of dry steam, induce a more perfect cirpulation of water, and yield a steady water- Further, the invention has for its object to reduce the cost of construction and erection of the boiler.

Further, the invention has for its object t provide an inner casing, bridgewall, and baiile-plates of novel construction.

The objects above set forth I am enabled to attain by means of my invention, which consists in the novel details of construction and in the combination, connection, and arrangement of parts hereinafter-described, and then pointed out in the claims.

In the accompanying drawings, forming part of this specification, wherein like letters of reference indicate like parts, Figure 1 is a front view illustrating a steam-boiler made in accordance with and embodying my invention. Fig. 2 is a side view thereof. Fig. 3 is an enlarged transverse section takenon the line 3 3 of Fig. 5, showing the interior construction of the boiler. Fig. 4 is a similar view taken on the line 4 4 of Fig. 5, and Fig. 5 is a longitudinal section taken on the line 5 5 of Fig. 3.

In said drawings, designates the boiler,

' the grate; 19, the ash-pit; 20, the bridgeinclined water-tubes supported at their for- 7 wall; 21, the steam-drum; 22, the horizontal ward ends in headers 23 and at their rear 55 ends in headers 24. 25 and 26 denote baffleplates supported transversely aboveand between said horizontal inclined water-tubes 22, and 27 denotes the uptake.

28 denotes the fuel-supply openings, and 29 the ash-pit openings, which are provided with the customary doors 30 and 31.

In the lower portion of the boiler adjacent to the sides 12 12 are supported mud-drums 32.

Within the outer casing 11, adjacent to the sides 12 12, are disposed square water tubes 33, which are arranged side by side closely together to form smooth unbroken walls and provided at their upper and lower ends with nipples. The nipples at the lower ends of the square tubes 33 are secured within the upper surfaces of the mud-drums 32, and the upper ends of said tubes 33 curved inwardly, and the nipples at the ends thereof secured in the steam-drum 21, alternately above and below the water-line thereof.

Within the mud-drums 32, near their forward and rear ends, are secured the nipples of the square transverse header-tubes 34 and 35, respectively, and into the inner opposing sides of the transverse headers 34 and 35 are secured the nipples of the square tubes 36, which tubes are arranged closely together and constitute the smooth base of the inner casing of the boiler, and 37 denotes hand hole covers provided in the outer surfaces of the transverse headers 34 and 35 in lines with the tubes 36, secured in said transverse headers. From the forward transverse header 34 extend upward and inward the vertical square headers 23, the upper ends of which nipple into the lower portion of the steam-drum 21, and the short inclined headers 38, the upper ends of which also nipple into the steamdrum 21, while the lower ends of each nipple into the upper ends of one of the square tubes 33, arranged at each side of the boiler.

\Vithin the rear sides of the vertical headers 23 are secured and supported the forward ends of the cylindrical water-tubes 22.

39 and 40 respectively denote short horizontal headers arranged in the front vertical headers 23 above the fuel-supply openings 28 and ash-pit openings 29. Said shorthorizontal headers '39 and 40 and the vertical headers 23 are provided with suitable hand-holes and covers to permit of access to the interior of said headers and the tubes nippling into the same.

From the rear square transverse header 35 extend upward and rearward the vertical headers 24, in the inner sides of which are secured and supported the rear ends of the cylindrical water-tubes 22. The rear surfaces of said vertical headers are also provided with suitable hand-holes and covers.

The baffle-plates 25 and 26 are arranged above the rear ends of the horizontal watertubes 22 and between the upper and lower sections of said tubes 22 at their forward ends, and consist of square tubes 41, arranged side by side closely together to form smooth plateswhich are disposed transversely to the horizontal water-tubes 22. The ends of the baffle-plate tubes 41 are provided with nipples which are secured within the inner opposing sides of the vertical tubes 33, extending upward from the mud drums 32 and constituting the sides of the inner casing of the boiler. The bridge-wall 20 is also composed of square tubes 42, which are superposed one above the other, forming a smooth unbroken wall and nippling at their ends into the inner surfaces of the square vertical tubes 33.

At the front of the bridge-wall 20, near its middle, is arranged a square tube 42, and about midway of the distance between the bridge-wall 20 and the front wall is arranged a similar tube 43, both of which nipple into the inner surfaces of the square tubes 33 and serve as supports for the grate 18.

It is to be observed that in the construction herein shown and described the products of combustion in passing through the boiler from the grate to the uptake are throughout their entire course of travel always impinging against or in-contact with the direct heating surfaces, and that the entire fire-space of the boiler being inclosed by water-tubes which communicate with the steam-drum the loss of heat by radiation is reduced to a minimum, and, further, that by separating the body of water into many small volumes surrounding the fire-space the rapid production of steam and a steady circulation of the water is insured.

Without limiting myself to the details of construction, which may be varied without departing from the spirit of my invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1. A steam-boiler comprising an outer cas-.

ing, grate, a steam-drum, a group of boilertubes, a bridge-wall and baffle-plates composed of water-tubes arranged within said outer casing, and an inner casing composed of water-tubes forming continuous smooth walls communicating with said steam-drum, mud-drum, bridge-wall and baffle-plates, substantially as specified.

2. A steam-boiler comprising an outer casing, grate, a steam-drum, mud-drum, boilertubes, a bridge-wall and bafile-plates composed of water-tubesarranged transversely to said boiler'tubes, and an inner casing and base composed of water-tubes forming continuous smooth walls communicating with the steam-drum, mud-drums, bridge-wall and baffle-plates, substantially as specified.

3. A steam-boiler comprising an outer casing, grate, a steam-drum, mud-drums, boilertubes, a bridge-wall and baffle-plates composed of water-tubes forming plates having smooth unbroken surfaces arranged transversely to the boiler-tubes, and an inner casing composed of vertical and horizontal wator-tubes forming smooth continuous walls communicating with the steam and mud drums, baffle-plates and bridge-wall, substantially as specified.

4. A steam-boiler comprising an outer casing, a 'grate, steam-drum, mud-drums, horizontal boiler-tubes, and a bridge-wall and baffle-plates composed of water-tubes, square transverse headers secured in the mud-drums adjacent to the forward and rear ends, square water-tubes arranged side by side at the base of the boiler and nippling into the square transverse headers intermediate the ends of themud-drums, square water-tubes arranged side by side and nippling at their lower ends into the upper sides of the mud-drums, and at their upper ends into the steam-drum, and communicating intermediate their upper and lower ends with the ends of the square tubes constituting the baffle-plates and bridge-wall secured therein, square vertical headers nippling at their lower ends into the square transverse headers intermediate the mud-drums; said vertical headers communicating with the horizontal boiler-tubes, and the forward headers communicating at their upper ends with the steam-drum, substantially as specified.

Signed at the city of New York, boroughof Brooklyn, Kings county, in the State of New York, this 1st day of March, 1902.

LEONARD L. GRIFFITHS.

Witnesses:

J. E. DUNWOODY, BENJ. ELY BERRY.

IIO 

